🚀 go-pugleaf

We have six identicallty configured RT 6150 Model 125s that are file serving
for a room full of RT 6152s.  One of the six 6150s will no longer boot from
the hard disk.  When a boot from the hard disk is attempted the two digit
display on the front of the machine will continuously cycle through the
following set of codes: "25 73 20 0c 00 98".  After displaying the "98" is a
pause of about three seconds and then the sequence starts over again.

We have determined that this is some indication that the machine can not
read the boot code off of the hard disk.  So, we replaced the hard drive,
same symptoms.  We replaced the disk adapter, same symptoms.  We even
replaced the system board, same symptoms.  Funny thing is that the machine
can be booted if one uses the SAUTIL floppy. If one tries to use the
"iplsource" utility on the SAUTIL floppy, it reports that the CRC is invalid
in the NVRAM.  So as a last resort we are going to replace the operator
panel (this has the NVRAM on it along with the TOD clock).

Has anyone else seen this behaviour in a 6150 Model 125 before?  What did
you or IBM do to correct it?  Any thoughts, hints, or magic incantations
would be apprecited.

--
Dan Ehrlich <ehrlich@cs.psu.edu>
Voice: +1 814 863 1142	FAX: +1 814 865 3176